World of Warcraft limits camping and kill-stealing issues by "instancing" certain areas of the gameAn instance is a section of dungeon or outdoor area that is privateNo other players, unless they are part of your group, can enter your instance of the dungeon/outdoor areaThere are also plenty of non-instanced common areas where players can meet and adventure together.
Mark Kern gives us a closer look at instancing in an interview on RPG Vault:
"An instance is a marked location that can be found in dungeons or outdoors by special, glowing portalsWhen players pass through them, they or their group is placed in a private part of a dungeonBecause they are alone, we are able to create special events such as puzzles that need multiple players to solve, along with bosses that can behave in more interesting and cinematic waysIn some ways, you can view the instance as our puzzle area, and the outdoors to be more like a Diablo-style playfieldInside instance, there will be tactical situations to unlock and different strategies that will need to be used to find the boss monsters deep in the dungeons, where outside areas will be more about exploration and slaying single or small groups of monsters."See some other information from cheap WOW Items, cheap WOW Power Leveling, and cheap wow account, WoW Gold.